Why my demodulated pulse train look like superimposed on a low frequency sinusoid?

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Muhammad 2024-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/2119256-why-my-demodulated-pulse-train-look-like-superimposed-on-a-low-frequency-sinusoid

评论： Muhammad 2024-5-16

I generated a pulse train from USRP device and transmited it at 3.5GHz the TX was coupled through a cable with Lecroy SDA 18000 device. I captured the whole signal down converted the signal but the recieved pulse train is looking like a alow frequency sinusoid where the pulse train is superimposed on it. How to solve this issue?

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Mathieu NOE 2024-5-16

seems sig_amp signal is not very good - or ? if I zoom inside the signal I see mostly quantization effects - why is the signal amplitude so low ? I suspect the "bad" demodulation could come from a bad input (modulated) signal ?

these are the first 2000 samples of sig_amp

Muhammad 2024-5-16

Thanks for pointing out towards this aspect. I attenuated the input signal before feeding to the oscilloscope. This could be the reason. I will try without attenuation.

Thanks a lot.

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